Spark-plug.



G. ANGER.

SPARK PLUG.

APPLlCATION FILED JAN. 24. 191?.

Patend Nov. 13, v1917'.

l fi is if l gg d GOTTLIEB ANGER, 0F MGKEES ROCKS, PENNSYLVANIA..

SPARK-PLUG.

specificati on of Letters Patent.

Patented Nov. 13, 1917.

.Application tiled January 24, 1917. Serial No. 144,226.

. To all whom it may concern.'

Be it known that I, GorrmEB ANGER, a citizen of the United States, residing at McKees Rocks, in thecounty of Allegheny Aand State of Pennsylvania, have invented certain new anduseful Improvements in Spark-Plugs, of which the following is a specification l This invention relates to spark plugs which are provided with an auxiliary sparking gap located on the outside of the cylinder so that the' operation of the'plug may be observed and any defects readily detected.

The invention has for itsobject to provide an efiicientplug of the kind stated, and also one which is simple in construction so that it may be cheaplyA produced and sold.

The object stated is attained'by means of a novel combination and4 arrangement .of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing forming apart of this specification.l

In the drawing,

Figure 1 is a side elevation of the plug;

Fig. 2 is a central longitudinal section thereof;

Fig. 3 is a cross-section -on the line 3-3 80 of Fig. 2, and

Fig. 4 is a perspective view of one of the electrodes.

Referring specifically to the drawing, 5 denotes the body of the plug, the same being 85 formed of a suitable insulating material.

the plugopening. The outer end of the electrode8 is provided with the usual means for making the current. conductor Wire conv nection, and its inner end projects a Short distance from the Icorresponding end of the plug. The shell 6 is open at its ends, leaving the ends of the plug and the sparking point .of the electrode 8 exposed.

Alongside the electrode 8 is mounted a second electrode 10 which is also incased in a packing sleeve 11 of insulating material,

said electrodeand sleeve seating snugly in an opening in the plug 5 and extending parallel to the electrode S. The two electrodes are therefore e'ectually insulated from each other.

'The electrode 10 does not extend throughout` the entire length of the plug 5, but stops 'short of the outer end thereof, the plug body here having a side recess or opening 12 into which the outer end of said electrode extends. The electrode 10 is a Hat bar having a lateral bend at one'end which is divided or forked to form two sparking points lf3. The.

8 seats therebetween, these being the'main sparking terminals of the plug.

The sparking lpoints 14 of the electrode 10 are located in the recess 12 and between the same extends a secondary electrode or V,grounding terminal 15 which isa short piece of wire'fastened to the metallic shell 6 and extending into the recess toseat between the.

sparking points 14. An auxiliary spark gap is thus produced in the recess 12 in order that the spark mayhere be observed. When a spark is produced inthe recess 12, the observer has the assurance that the plug is sparking at the main spark gap in the cylinder. The recess 12 is fitted with a trans parent closure 16 which may be a piece of isinglass or other suitable transparentmate.- rial. This closure eliminates all danger of explosion'of any gaseslwhichmaybe outside of the cylinder. In order that the shell 6 may not cut oil' the recess 12 from view, it is provided with anopening 17 in line with the recess.

A portion of the electrode 8 which is housed in the sleeve .9 is flattened, as shown at 1S, so that it cannot pull out or turn in said sleeve. The electrode 10 is securely packed between the two layers 9 and 11- of insulation. y w 4 A plug. constructed as hereinbefore de. scribed can-be made and sold at a low price, and it is highly efficient in operation, the spark at the cylinder end of th'e`plug being much stronger than th at in theordinary spark Ifthere is no spark at' plugs now in use. the auxiliary spark gap, the operator will know at onceth'at the plug is not 4working properly, and the condition of the plug may therefore always be observed without removing it from the engine cylinder.

tlie body and being arran ed to spark-gap therebetween, an one '0 said elec I claim:

1. A spark plug having a body of insula ing material provided with a side recess, a

lshell -of'iconducting material ncasin said body and having an opening in line with the aforesaid recess, electrodes carredby the body and insulated from each other, the in-. ner ends 'of the electrodes projecting from roduce a A 'sulated from each other, the inner en'ds of the electrodes being arranged to produce a main spark gapat thel cylinder end of the plug, and one of the electrodes extending into the side recess, and. a third electrode grounded on the aforesaid support and cooperating .with the last-mentioned electrode to produce an auxiliary spark'gap in the side recess in its side, a support of conductmg material for said ,bOdy, electrodes carried by the body and insulated from each other, the inner 'end of the plug, and one o l A-spark plug having a body of insulating material provided with a sight opening ends of the electrodes being arranged to produce a main spark gafp atthe cylinder the electrodes extendin into the sight opening, and a third electro e grounded on the aforesaid support and coperating with the last-mentioned electrode to roduce an auxiliary spark gap in said opening, the electrode which extends.

into the sight opening being aflat strip which has its ends divided to form two laterally spaced sparking points betweenI which the'other electrodes extend.

`4f. In a spark plug, an electrode comprising a flat strip having its end divided -to form two laterally spaced sparking terminals, and a second electrode separate from the strip and having' its sparking terminal located between said spaced terminals.

5. In a spark plu'g, a body of insulating material having a longitudinal opening, a support of conducting material for said body, an electrode rod, and a packing in which the rod is inclosed, said packing and the rod being mounted in the aforesaid opening, and a portion of the rod -inclosed in the packing being flattened to-prevent longitudr' nal and rotary movement of the rod-1n the packing, said rod projecting from the outer end of the insulating body and having thereat means for current conductor connection.

In testimony whereof I aix my signature .in the presence of two witnesses.

GOTTLIEB ANGER.

Witnesses:

CHAs. F. ENGEL, AGNES DoUGHEm. 

